单项选择题

Frederick II's experiment was to______.

A．find out what role careful nursing would play in teaching child to speak
B．discover what language a child would speak without hearing any human speech
C．prove that children are born with the ability to speak
D．prove that a child be damaged without learning a language

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单项选择题

What does the sentence A bird learns to sing and to fly rapidly at the right time... (Para. 3) mean

A．A bird learns to sing and fly after twelve weeks.
B．A bird learns to sing and fly when it is old enough.
C．An infant learns to smile and make vowel-like sounds at twelve weeks.
D．A bird learns to sing and fly fast at a certain stage.